Improve out of space error handling
Improve out of space error handling

(cherry picked from commit 8bc0cb89f730e04fa7eddf9c56be208333150cb9)

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend